diff --git a/service_scan.cc b/service_scan.cc
index a6158dcc5..8cab4aafe 100644
--- a/service_scan.cc
+++ b/service_scan.cc
@@ -1664,9 +1664,9 @@ ServiceGroup::ServiceGroup(vector<Target *> &Targets, AllProbes *AP) {
 
   SPM = new ScanProgressMeter("Service scan");
   desired_par = 1;
-  if (o.timing_level == 3) desired_par = 10;
-  if (o.timing_level == 4) desired_par = 15;
-  if (o.timing_level >= 5) desired_par = 20;
+  if (o.timing_level == 3) desired_par = 20;
+  if (o.timing_level == 4) desired_par = 30;
+  if (o.timing_level >= 5) desired_par = 40;
   // TODO: Come up with better ways to determine ideal_parallelism
   ideal_parallelism = box(o.min_parallelism, o.max_parallelism? o.max_parallelism : 100, desired_par);
 }